摘要:

Mount Etna contains a mosaic of habitats that maintain a rich bird fauna. Between 1981 and 1986 we detected 77 breeding bird species. At the lowest altitudes, the shrubby maquis and the oak woods harbour high populations of Mediterranean species. Above 1000 m dominant conifers (Pinus laricio)contain fewer species with lower diversity in even‐aged stands, but with higher values in the uneven‐aged conifer stands mixed with birch trees (Betula aetnensis).Forest edges yield the highest evenness and richness of the bird communities of Etna, while high‐altitude scrub contains the fewest number of species. Both forest edges and high altitude scrub har bour the highest number of species restricted to these habitat types. These data could be useful in the management of the Regional Park of Etna.

ISSN:0373-4137    

DOI:10.1080/11250008909355661

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

The secretion of the parotoid glands of six species of toads of the genusBufohas been analysed with circular chromatograpy. From the resulting bands a ≪dissimilarity matrix≫ was constructed. The numerical data, derived from a computer program, yielded a den drogram of the evolution of the analysed secretion that fits well with dendrograms obtained for the corresponding species in pre vious studies using various biological parameters. The easy‐to‐perform chromatographic technique described in this paper could have various biological applications.

ISSN:0373-4137    

DOI:10.1080/11250008909355662

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

Allozymic and biometric analyses were conducted on 195 speci mens belonging to the genusApodemusfrom Israel. Genetic varia tion and differentiation were investigated by means of electro‐phoretic analysis of 36 gene loci. The electrophoretic results, com bined with biometric analysis, indicated the existence of a newApodemusspecies,A. hermonensis,for which a formal description is given. The most common species in Israel, afterA. mystacinus,isA. flavicollisand notA. sylvaticus,as commonly believed. So far we have found noA. sylvaticusin Israel.A. hermonensiswas found on Mount Hermon, at about 2000 m. The body and skull sizes are intermediate between those ofA. micropsandA. sylvaticus.Geneti cally, it is very close toA. flavicollis,from which it can be distin guished by one locus(Np)fixed for an allele never found in Israeli populations ofA. flavicollis,and another locus which is partially discriminant (Ada).In bothA. mystacinusandA. flavicollis,the Israeli populations showed low values of genetic distance in in‐traspecific comparisons (0.002 ≤ D ≤ 0.010). High genetic dis tance was found betweenA. mystacinusandA. flavicollis (D =0.460) and betweenA. mystacinusandA. hermonensis (D =0.463). A low mean genetic distance was found betweenA. flavicollisandA. hermonensis, D =0.057, suggesting a recent speciation event in the isolated population found on the heights of Mount Hermon.

ISSN:0373-4137    

DOI:10.1080/11250008909355663

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

ISSN:0373-4137    

DOI:10.1080/11250008909355664

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

ISSN:0373-4137    

DOI:10.1080/11250008909355650

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor